Deadlock Vulnerability in Linux Kernel Bluetooth RFCOMM - CVE-2023-53016
Summary
CVE-2023-53016: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix possible deadlock in rfcomm_sk_state_change syzbot reports a possible deadlock in rfcomm_sk_state_change [1]. Affects linux versions < 6.1.11-1. Fixed in 6.1.11-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It supports a wide range of functionalities, including networking, file systems, and device management. This vulnerability specifically affects the Bluetooth RFCOMM (Radio Frequency Communication) protocol, which is used for serial communication over Bluetooth connections. The issue arises from a potential deadlock scenario that can occur during socket state changes, impacting the stability of Bluetooth connections.
Vulnerability Detail
The vulnerability identified as CVE-2023-53016 is a potential deadlock in the rfcomm_sk_state_change function within the Linux kernel's Bluetooth implementation. The deadlock occurs when the rfcomm_sock_connect function acquires the sk lock and waits for the rfcomm lock, while simultaneously, the rfcomm_sock_release function may hold the rfcomm lock and attempt to acquire the sk lock. This situation can lead to a system hang, affecting the performance and reliability of Bluetooth communications. The technical flow of the deadlock involves locking mechanisms that are not released in the correct order, which can be exploited under certain conditions.
How To Fix
Minimum fixed version
6.1.11-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the available patch by updating the Linux kernel as described in the 'how_to_fix' section.
Conclusion
CVE-2023-53016 represents a significant vulnerability in the Linux kernel's Bluetooth RFCOMM implementation, which can lead to deadlocks and system instability. Users are strongly advised to update their systems to the patched version to ensure continued reliability and security of Bluetooth communications.
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FAQ
CVE-2023-53016 is a vulnerability in the Linux kernel's Bluetooth RFCOMM implementation that can lead to a potential deadlock, affecting Bluetooth communication.
This vulnerability can cause system hangs or crashes during Bluetooth operations, leading to instability in Bluetooth connections.
If you are using a version of the Linux kernel prior to 6.1.11-1, your system may be vulnerable to this issue. You can check your kernel version using the command 'uname -r'.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
While there are no specific workarounds, it is recommended to prioritize updating your kernel to mitigate the risk associated with this vulnerability.
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